Left chin pain on pressure may be caused by acute injury, local soft tissue infection, tumor and other factors. 1. Acute injury: when the left chin area suffers acute injury, such as field strikes, it may lead to local soft tissue or bone damage, which will cause pain when pressed, and may be accompanied by swelling and other symptoms. 2. Local soft tissue infection: the local skin of the left chin has bacterial or fungal infection, due to the stimulation of inflammatory substances, resulting in local skin damage, which will cause pain when pressed, accompanied by itching. 3. Tumor: If there is a tumor at the jawbone, which destroys the bone, or presses the surrounding tissues, it will also produce pressing pain. There are many reasons for left jaw pain, if the symptoms are more serious, you should pay attention to it, and seek medical treatment as soon as possible to prevent delays in the condition.